On-Site Quantitative Elemental Analysis of Metal Ions in Aqueous Solutions by Underwater Laser-Induced Breakdown Spectroscopy Combined with Electrodeposition under Controlled Potential

We propose a technique of on-site quantitative analysis of Zn2+ in aqueous solution based on the combination of electrodeposition for preconcentration of Zn onto a Cu electrode and successive underwater laser-induced breakdown spectroscopy (underwater LIBS) of the electrode surface under electrochem...

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Published inAnalytical chemistry (Washington) Vol. 87; no. 3; pp. 1655 - 1661
Main Authors Matsumoto, Ayumu, Tamura, Ayaka, Koda, Ryo, Fukami, Kazuhiro, Ogata, Yukio H, Nishi, Naoya, Thornton, Blair, Sakka, Tetsuo
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 03.02.2015
Subjects
Aqueous solutions
Breakdown
Deformation
Electrodeposition
Electrodes
Ions
Lasers
Metals
Quantitative analysis
Spectroscopy
Spectrum analysis
Underwater
Zinc
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Summary:We propose a technique of on-site quantitative analysis of Zn2+ in aqueous solution based on the combination of electrodeposition for preconcentration of Zn onto a Cu electrode and successive underwater laser-induced breakdown spectroscopy (underwater LIBS) of the electrode surface under electrochemically controlled potential. Zinc emission lines are observed with the present technique for a Zn2+ concentration of 5 ppm. It is roughly estimated that the overall sensitivity over 10 000 times higher is achieved by the preconcentration. Although underwater LIBS suffers from the spectral deformation due to the dense plasma confined in water and also from serious shot-to-shot fluctuations, a linear calibration curve with a coefficient of determination R 2 of 0.974 is obtained in the range of 5–50 ppm.
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ISSN:0003-2700
1520-6882
DOI:10.1021/ac503737c